Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
67 views
in Aptitude by (114k points)
closed by

The average salary for all staff of a school is Rs. 8000. The average salary of 12 technical staff is Rs. 72,000 and non-technical staff average salary is Rs. 7000, then find the number of non-technical staff.


1. 768
2. 204
3. 504
4. 780

1 Answer

0 votes
by (113k points)
selected by
 
Best answer
Correct Answer - Option 1 : 768

Given:

The average salary of all staff is 8000

The average salary of 12 technical staff is 72000

The average salary of non-technical staff is 7000

Formula used:

Average = (Sum of all observations)/(Total number of observations)

Calculation:

Let the number of non-technical staff be x

⇒ Total staff = (12 + x)

The total salary of staff = The average salary of total staff × Total number of staff

The average salary of all staff is 8000

⇒ The total salary of staff = 8000 × (12 + x)

The average salary of 12 technical staff is 72000

⇒ The total salary of technical staff = 72000 × 12 

The average salary of x non-technical staff is 7000

⇒ The total salary of non-technical staff = 7000x

The total salary of all staff = Total salary of technical staff + Total salary of non-technical staff

⇒ 8000 × (12 + x) = 72000 × 12 + 7000x

⇒ 8(12 + x) = 72 × 12 + 7x 

⇒ 96 + 8x = 864 + 7x

⇒ x = 864 - 96

⇒ 768 

∴ The number of non-teachnical staff is 768

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...